Got my watch back from service today! I was very surprised with all the parts they replaced!
That is all pretty standard for the service center. There are typically a lot of parts wasted when servicing at Omega. There's likely nothing wrong with the hands, but they get replaced as standard practice at each service.
The HEV can just have the two seals replaced inside, but they replace the entire unit - not really needed. The kicker is the vale they replaced it with can;t be repaired like the original one could, so now there's no choice but to replace the entire unit at every service, when all it needs is those two small Orings replaced. I always do whatever I can to preserve the type than van be serviced, as a new valve is over $80, where the two seals are $19.
The mainspring barrel they replace the entire unit instead of just replacing the spring - the spring is often the only thing that needs replacing, so they throw away a perfectly good barrel drum, barrel cover, and barrel arbor. They don't even disassemble it to check the condition, because that takes time.
The rotor is another example - the bearing can be replaced, but there's likely some wear on the top of the rotor that is purely cosmetic, that prompted it to be replaced.
So this comment is absolutely true:
I think the omega service centers usually rather replace as much as possible to get the watch back to as-close-to-new-condition as possible.
An independent may replace less parts.
Independent watchmakers tend to replace what's needed only, and not a lot of additional parts that are just fine.